Can`t win the Walchie mission (the 15 minutes mission)

In the Walchie mission, the one that you have to stand 15 minutes, I pass the 15 minutes, but nothing seems to happen.Then the enemy forces become too strong and I lose because they destroy my "Techlab".

Not yet 100% sure if loading is the cause, but yes, it would be a bug. You would have to wait for the next update to fix it (or if you want a challenge, try to beat it without loading - then we would also know if loading is the cause).